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  <title>Returns the lengths of the columns of the current row in the result set</title>
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  <div id="layout-content"><div id="function.maxdb-fetch-lengths" class="refentry">
 <div class="refnamediv">
  <h1 class="refname">maxdb_fetch_lengths</h1>
  <h1 class="refname">maxdb_result::lengths</h1>
  <p class="verinfo">(PECL maxdb &gt;= 1.0)</p><p class="refpurpose"><span class="refname">maxdb_fetch_lengths</span> -- <span class="refname">maxdb_result::lengths</span> &mdash; <span class="dc-title">Returns the lengths of the columns of the current row in the result set</span></p>

 </div>

 <div class="refsect1 description" id="refsect1-function.maxdb-fetch-lengths-description">
  <h3 class="title">说明</h3>
  <p class="para">过程化风格</p>
  <div class="methodsynopsis dc-description">
   <span class="methodname"><strong>maxdb_fetch_lengths</strong></span>
    ( <span class="methodparam"><span class="type">resource</span> <code class="parameter">$result</code></span>
   ) : <span class="type">array</span></div>

  <p class="para rdfs-comment">面向对象风格</p>
  <div class="fieldsynopsis"><span class="type">array</span> <var class="varname">$maxdb_result-&gt;lengths</var>;</div>

  <p class="para">
   The <span class="function"><strong>maxdb_fetch_lengths()</strong></span> function returns an array containing the
   lengths of every column of the current row within the result set represented by the
   <code class="parameter">result</code> parameter. If successful, a numerically indexed array
   representing the lengths of each column is returned 或者在失败时返回 <strong><code>FALSE</code></strong>.
  </p>
 </div>


 <div class="refsect1 returnvalues" id="refsect1-function.maxdb-fetch-lengths-returnvalues">
  <h3 class="title">返回值</h3>
  <p class="para">
   An array of integers representing the size of each column (not including
   any terminating null characters). <strong><code>FALSE</code></strong> if an error occurred.
  </p>
  <p class="para">
   <span class="function"><strong>maxdb_fetch_lengths()</strong></span> is valid only for the current row of the result set.
   It returns <strong><code>FALSE</code></strong> if you call it before calling maxdb_fetch_row/array/resource or after retrieving
   all rows in the result.
  </p>
 </div>


 <div class="refsect1 examples" id="refsect1-function.maxdb-fetch-lengths-examples">
  <h3 class="title">范例</h3>
  <div class="example" id="example-1353">
   <p><strong>Example #1 面向对象风格</strong></p>
   <div class="example-contents">
<div class="phpcode"><pre><span style="color: #000000">
<span style="color: #0000BB">&lt;?php<br />$maxdb&nbsp;</span><span style="color: #007700">=&nbsp;new&nbsp;</span><span style="color: #0000BB">maxdb</span><span style="color: #007700">(</span><span style="color: #DD0000">"localhost"</span><span style="color: #007700">,&nbsp;</span><span style="color: #DD0000">"MONA"</span><span style="color: #007700">,&nbsp;</span><span style="color: #DD0000">"RED"</span><span style="color: #007700">,&nbsp;</span><span style="color: #DD0000">"DEMODB"</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">/*&nbsp;check&nbsp;connection&nbsp;*/<br /></span><span style="color: #007700">if&nbsp;(</span><span style="color: #0000BB">maxdb_connect_errno</span><span style="color: #007700">())&nbsp;{<br />&nbsp;&nbsp;&nbsp;</span><span style="color: #0000BB">printf</span><span style="color: #007700">(</span><span style="color: #DD0000">"Connect&nbsp;failed:&nbsp;%s\n"</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">maxdb_connect_error</span><span style="color: #007700">());<br />&nbsp;&nbsp;&nbsp;exit();<br />}<br /><br /></span><span style="color: #0000BB">$query&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #DD0000">"SELECT&nbsp;*&nbsp;from&nbsp;hotel.customer&nbsp;WHERE&nbsp;cno&nbsp;=&nbsp;3000"</span><span style="color: #007700">;<br /><br />if&nbsp;(</span><span style="color: #0000BB">$result&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">$maxdb</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">query</span><span style="color: #007700">(</span><span style="color: #0000BB">$query</span><span style="color: #007700">))&nbsp;{<br /><br />&nbsp;&nbsp;&nbsp;</span><span style="color: #0000BB">$row&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">$result</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">fetch_row</span><span style="color: #007700">();<br /><br />&nbsp;&nbsp;&nbsp;</span><span style="color: #FF8000">/*&nbsp;display&nbsp;column&nbsp;lengths&nbsp;*/<br />&nbsp;&nbsp;&nbsp;</span><span style="color: #007700">foreach&nbsp;(</span><span style="color: #0000BB">$result</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">lengths&nbsp;</span><span style="color: #007700">as&nbsp;</span><span style="color: #0000BB">$i&nbsp;</span><span style="color: #007700">=&gt;&nbsp;</span><span style="color: #0000BB">$val</span><span style="color: #007700">)&nbsp;{<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="color: #0000BB">printf</span><span style="color: #007700">(</span><span style="color: #DD0000">"Field&nbsp;%2d&nbsp;has&nbsp;Length&nbsp;%2d\n"</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">$i</span><span style="color: #007700">+</span><span style="color: #0000BB">1</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">$val</span><span style="color: #007700">);<br />&nbsp;&nbsp;&nbsp;}<br />&nbsp;&nbsp;&nbsp;</span><span style="color: #0000BB">$result</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">close</span><span style="color: #007700">();<br />}<br /><br /></span><span style="color: #FF8000">/*&nbsp;close&nbsp;connection&nbsp;*/<br /></span><span style="color: #0000BB">$maxdb</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">close</span><span style="color: #007700">();<br /></span><span style="color: #0000BB">?&gt;</span>
</span>
</pre></div>
   </div>

  </div>
  <div class="example" id="example-1354">
   <p><strong>Example #2 过程化风格</strong></p>
   <div class="example-contents">
<div class="phpcode"><pre><span style="color: #000000">
<span style="color: #0000BB">&lt;?php<br />$link&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">maxdb_connect</span><span style="color: #007700">(</span><span style="color: #DD0000">"localhost"</span><span style="color: #007700">,&nbsp;</span><span style="color: #DD0000">"MONA"</span><span style="color: #007700">,&nbsp;</span><span style="color: #DD0000">"RED"</span><span style="color: #007700">,&nbsp;</span><span style="color: #DD0000">"DEMODB"</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">/*&nbsp;check&nbsp;connection&nbsp;*/<br /></span><span style="color: #007700">if&nbsp;(</span><span style="color: #0000BB">maxdb_connect_errno</span><span style="color: #007700">())&nbsp;{<br />&nbsp;&nbsp;&nbsp;</span><span style="color: #0000BB">printf</span><span style="color: #007700">(</span><span style="color: #DD0000">"Connect&nbsp;failed:&nbsp;%s\n"</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">maxdb_connect_error</span><span style="color: #007700">());<br />&nbsp;&nbsp;&nbsp;exit();<br />}<br /><br /></span><span style="color: #0000BB">$query&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #DD0000">"SELECT&nbsp;*&nbsp;from&nbsp;hotel.customer&nbsp;WHERE&nbsp;cno&nbsp;=&nbsp;3000"</span><span style="color: #007700">;<br /><br />if&nbsp;(</span><span style="color: #0000BB">$result&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">maxdb_query</span><span style="color: #007700">(</span><span style="color: #0000BB">$link</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">$query</span><span style="color: #007700">))&nbsp;{<br /><br />&nbsp;&nbsp;&nbsp;</span><span style="color: #0000BB">$row&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">maxdb_fetch_row</span><span style="color: #007700">(</span><span style="color: #0000BB">$result</span><span style="color: #007700">);<br /><br />&nbsp;&nbsp;&nbsp;</span><span style="color: #FF8000">/*&nbsp;display&nbsp;column&nbsp;lengths&nbsp;*/<br />&nbsp;&nbsp;&nbsp;</span><span style="color: #007700">foreach&nbsp;(</span><span style="color: #0000BB">maxdb_fetch_lengths</span><span style="color: #007700">(</span><span style="color: #0000BB">$result</span><span style="color: #007700">)&nbsp;as&nbsp;</span><span style="color: #0000BB">$i&nbsp;</span><span style="color: #007700">=&gt;&nbsp;</span><span style="color: #0000BB">$val</span><span style="color: #007700">)&nbsp;{<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="color: #0000BB">printf</span><span style="color: #007700">(</span><span style="color: #DD0000">"Field&nbsp;%2d&nbsp;has&nbsp;Length&nbsp;%2d\n"</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">$i</span><span style="color: #007700">+</span><span style="color: #0000BB">1</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">$val</span><span style="color: #007700">);<br />&nbsp;&nbsp;&nbsp;}<br />&nbsp;&nbsp;&nbsp;</span><span style="color: #0000BB">maxdb_free_result</span><span style="color: #007700">(</span><span style="color: #0000BB">$result</span><span style="color: #007700">);<br />}<br /><br /></span><span style="color: #FF8000">/*&nbsp;close&nbsp;connection&nbsp;*/<br /></span><span style="color: #0000BB">maxdb_close</span><span style="color: #007700">(</span><span style="color: #0000BB">$link</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">?&gt;</span>
</span>
</pre></div>
   </div>

  </div>
  <p class="para">以上例程的输出类似于：</p>
  <div class="example-contents screen">
<div class="cdata"><pre>
Field  1 has Length  4
Field  2 has Length  3
Field  3 has Length  5
Field  4 has Length  6
Field  5 has Length  5
Field  6 has Length 21
</pre></div>
  </div>
 </div>


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